Institute of Chemistry (Far Eastern Branch of Russian Academy of Sciences), Vladivostok, Russia:

P. S. Gordienko, Head of Laboratory, Professor, e-mail: pavel.gordienko@mal.ru

O. S. Vasilenko, Junior Researcher

Far Eastern Federal University, Vladivostok, Russia.
V. A. Dostovalov, Professor, e-mail: dostovalov2001@mail.ru

Institute of Marine Technologies (Far Eastern Branch of Russian Academy of Sciences), Vladivostok, Russia:
D. V. Dostovalov, Researcher, e-mail: gussar2009@mail.ru

Titanium alloys are widely used in modern shipbuilding constructions. Their application in manufacturing of units and details, used with other machinebuilding materials in the sea water, causes a range of problems, including rather big corrosion in the contact zone. Applying the protective dielectric coatings on titanium products surface is an urgent task of shipbuilding. A method of micro-arc oxidation is the most prospective; it is used obtaining the multifunctional modified alloys (coatings) with a wide complex of properties. Earlier, the investigators could not control the energy, input in the puncture channel, which was the main disadvantage of the considered process: big losses of energy were caused; electrolyte was heated; structure of subsurface layer of the material was uncontrollably changed; and defect surface was formed in the structure with its following failure. The offered method of electrochemical process control, designed equipment and programs show the new possibilities:
– investigation of the mechanism of growth of oxide layers with critical parameters (high potentials and current densities);
– definition of the influence of heat and electrochemical factors on coatings formation mechanisms;
– creation of new energy-saving technological processes of treatment of metals and alloys in electrolytes.
The developed computer system allows the setting of parameters of coating formation and obtaining the data about the process of its formation depending on parameters.

1. Suminov I. V., Belkin P. N., Epelfeld A. V., Lyudin V. B., Krit B. L., Borisov A. M. Plasma-electric modification of metals and alloys. Moscow : Tekhnosfera, 2011. 464 p.
2. Gordienko P. S., Dostovalov V. A., Efimenko A. V. Micro-arc oxidation of metals and alloys. Vladivostok : Publishing House of Far Eastern Federal University, 2013. 522 p.
3. Shatalov V. K., Lysenko L. V., Minaev A. N., Sulina O. V., Shtokal A. O. Methods of micro-arc oxidation of detail surfaces from titanium alloys. Nauka i obrazovanie. 2013. No. 7. pp. 1–19.
4. Laleh M., Sabour Rouhaghdam A., Shahrabi T., Shanghi A. Effect of alumina sol addition to micro-arc oxidation electrolyte on the properties of MAO coatings formed on magnesium alloy AZ91D. Journal of Alloys and Compounds. 2010. Vol. 496. pp. 548–552.
5. Sulina O. V. Physical basis and methods of formation of protective coatings on titanium detals with various geometry by micro-arc oxidation : thesis of inauguration of Dissertation … of Candidate of Engineering Sciences. Moscow, 2013. 16 p.
6. Vinogradov A. V. Development and investigation of current source for microarc oxidation of tool details and assessment of its technological possibilities : Dissertation … of Candidate of Engineering Sciences. Moscow, 2013. 194 p.
7. Gordienko P. S., Dostovalov V. A., Dostovalov D. V., Zhevtun I. G. Methods of formation of wear-resistant coating from titanium carbide. Patent RF, No. 2424352 ; IPC C 23 C 14/06. Applied : 23.03.2009. Published : 20.07.2011. Bulletin No. 27.
8. Xu X., Lu P., Guo M., Fang M. Cross-linked gelatin/nanoparticles composite coating on micro-arc oxidation film for corrosion and drug release. Applied Surface Science. 2010. Vol. 256. pp. 2367–2371.
9. Li S., Yin Y., Shen D., Zu Y., Qu C. Tribological performance of ceramic composite coatings obtained through microarc oxidation on Ly12 aluminum alloy. Key Engineering Materials. 2013. Vol. 537. pp. 7–11.
10. Zhou G., Ding H., Zhang Y. Fretting wear study on micro-arc oxidation TiO₂ coating on TC₄ titanium alloys in simulated body fluid. Tribology Letters. 2010. Vol. 40, No 3. pp. 319–326.
11. Kazantsev I. A., Krivenkov A. O., Chugunov S. N., Kryukov D. B. Thermophysical properties of materials produced by micro-arc oxidation. Materialovedenie. 2011. No. 3. pp. 22–27.
12. Gordienko P. S., Vasilenko O. S., Kharchenko U. V., Usoltsev V. K. Effect of relative pulse duration on cathode relaxation processes and electrochemical properties of forming titanium coatings. Perspektivnye materialy. 2013. No. 11. pp. 59–64.